Use C++17 feature - structured bindings

Summary:
Changelog: [internal]

Trying out C++ 17 feature: structured bindings.

Reviewed By: PeteTheHeat

Differential Revision: D27462634

fbshipit-source-id: 336f771e9579124f429ec648ee418f7ac52cd6a3

React/Fabric/Mounting/ComponentViews/Modal/RCTModalHostViewComponentView.mm

@@ -241,9 +241,9 @@ static ModalHostViewEventEmitter::OnOrientationChange onOrientationChangeStruct(
   self.viewController.supportedInterfaceOrientations = supportedOrientationsMask(newProps.supportedOrientations);
 #endif
 
-  std::tuple<BOOL, UIModalTransitionStyle> result = animationConfiguration(newProps.animationType);
-  _shouldAnimatePresentation = std::get<0>(result);
-  self.viewController.modalTransitionStyle = std::get<1>(result);
+  auto const [shouldAnimate, transitionStyle] = animationConfiguration(newProps.animationType);
+  _shouldAnimatePresentation = shouldAnimate;
+  self.viewController.modalTransitionStyle = transitionStyle;
 
   self.viewController.modalPresentationStyle = presentationConfiguration(newProps);